This went the way of the dance studio - it never happened. If it did, it reverted back on the first reset. There isn’t one single theorycrafter who’s been able to pin down a spawn timer that’s less than what it always was.
This doesn’t increase the amount of black lotus spawning. It just gives more locations where it can spawn - it’s still one per zone.
Blizzard hasn’t done jack in anniversary to solve the BL problem.